Confidence interval determine for a population mean
A 99% confidence interval determine for a population mean was computed to be (31.1, 48.3). Determine the mean of the sample, which was used to determine the interval estimate (show all work).
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Assume that the mean score on a certain aptitude test across the nation is 100, and that the standard deviation is 20 points. Determine the probability that the mean aptitude test score for a randomly selected group of 150 8th graders is between 9
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Suppose that a sample is drawn and z(?/2) = 1.65 and ? = 25. Answer the following questions: If the Maximum Error of Estimate is 0.04 for this sample, what would be the sample size? Given that the sample Size is 400 with this same z(?/2) and ?, what
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A study was conducted to determine the mean amount spent on birthday gifts for typical family having two children. A sample of 190 was taken, and the mean amount spent was $234.01. Supposing a standard deviation equal to $35.51, determine the 98%
A confidence interval determine for the population mean is given to be (35.71, 44.14). If the standard deviation is 13.045 and the sample size is 52, answer each of the following (show all work):
Ariana took two hour longer to drive 360 mi on first day of trip than she took to drive 270 mi. on second. If the speed was same on both days, find the driving time each day?
A study is performed to discern if there is any difference in sitting heart rate between those who have two or less cups of coffee per day and those who have three or more cups per day. Subjects are selected at random based upon whether they drink
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